Inter-Agency GNC V&V Workshop (IAGNC 2025)

Tutorial Short Course

Tutorial Short Course on Modeling, Control, Analysis and V&V applied to robust attitude control of a large flexible spacecraft

 

Speakers: Daniel Alazard*, Francesco Sanfedino*, Jean-Marc Biannic**, Clément Roos**

* ISAE-SUPAERO, Toulouse, France

** ONERA, Toulouse, France

During this 2 days tutorial short course the attendee will have a hands-on training:

Figure. The proposed study case composed of a rigid body, 2 symmetrical flexible solar arrays at a varying angular configuration and 4 reactions wheels in a pyramidal configuration.

• on the modeling tool SDTlib used to create under  MATLAB/SIMULINK the 6 degrees of freedom model of a large flexible spacecraft (see Figure), fully parametrized  according to the uncertain parameters and  the varying  geometrical configuration (solar array angular  configuration),
• on the robust attitude control of the uncertain model to meet multi-objective  specifications,
• on the robustness analysis tools SMART and STOWAT for robust performance assessment form a deterministic  point of view or stochastic  point of view.

The objective of this training is to show how these tools can be used to   take into account V&V considerations as soon as possible in the design process  and very early in the preliminary design phase and to see the complementarity between deterministic and probabilistic µ-analysis tools.

Attendee profile: industrial engineers, space agency staff, academics, PhD students with a background in space engineering, mechanical engineering and servo-loop systems

A one week license of the SDTlib (developed and distributed by DyCSyT) and of the SMART/STOWAT toolbox (developed by ONERA) will be provided to all the attendees.

A desktop computer with MATLAB will be provided to each attendee who can also use his own laptop (with the required MATLAB toolboxes). Lunches are also included in the price.

Detailed program:

DAY 1:

• Monday July 7-th: 09:00 - 10:30 : basic principles on flexible multi-body dynamics and the TITOP (Two-Input Two-Output Port) model approach,
• Monday July 7-th 10:30 - 11:00: coffee break  / Q&A
• Monday July 7-th: 11:00 – 12:30 : development of the use case model (a spacecraft with 2 symmetrical flexible solar panel with variable angular configuration)
• Monday July 7-th: 12:30 – 14:00 : lunch
• Monday July 7-th: 14:00 – 15:30 : development of the use case model  (cont.) Frequency domain analysis.
• Monday July 7-th: 15:30 – 16:00: coffee break  / Q&A
• Monday July 7-th: 16:00 - 17:30: design of a robust attitude controller with the Matlab Robust Control toolbox.

DAY 2:

• Tuesday July 8-th: 09:00 - 10:15 : basic principles of  µ-based robustness analysis
• Tuesday July 8-th: 10:15 - 10:45: coffee break  / Q&A
• Tuesday July 8-th: 10:45 – 11:45: illustrations on simple study cases with the SMART toolbox
• Tuesday July 8-th: 11:45 - 12:30: introduction to probabilistic µ-analysis and the STOWAT toolbox
• Tuesday July 8-th: 12:30 – 14:00 : Lunch
• Tuesday July 8-th: 14:00 – 15:30 : application of STOWAT to simple study cases and comparisons with standard Monte-Carlo approaches
• Tuesday July 8-th: 15:30 -  16:00: coffee break  / Q&A
• Tuesday July 8-th: 16:00 - 17:30: application of SMART & STOWAT to the use case model developed during day 1

References:

1. Alazard, Daniel and Sanfedino, Francesco. Satellite dynamics toolbox for preliminary design phase. (2020) In : 43rd Annual AAS Guidance and Control Conference, 30 January 2020 - 5 February 2020 (Breckenridge, United States).
2. Sanfedino Francesco, Alazard Daniel, Kassarian Ervan, Somers Franca, Satellite Dynamics Toolbox Library : a tool to model multi-body space systems for robust control synthesis and analysis. 2023, 22nd IFAC World Congress, 2023-07-14 - 2023-07-09 (2023-07-09, Yokohama) Satellite Dynamics Toolbox Library: a tool to model multi-body space systems for robust control synthesis and analysis
3. https://dycsyt.com/publications/
4. Roos Clément, Biannic Jean-Marc and Evain Hélène. A new step towards the integration of probabilistic µ in the aerospace V&V process. CEAS Space Journal 16(1), 59-71. 2024
5. Somers Franca, Roos Clément, Biannic Jean-Marc, Sanfedino Francesco, Preda Valentin, Bennani Samir and Evain Hélène. Delay margin analysis of uncertain linear control systems using probabilistic µ. Under minor revision for International Journal of Robust and Nonlinear Control. 2024.
6. Biannic Jean-Marc, Roos Clément, Bennani Samir, Boquet Fabrice, Preda Valentin and Girouart Bénédicte. Advanced probabilistic μ-analysis techniques for AOCS validation. European Journal of Control (62) 120-129, 2021.